edited by Galen Wood Ewing
M. Dekker, 1997
Buku Referensi
Soisson, Harold E.
John Wiley & Sons, 1975
Buku Teks
Ramey, Robert L.
Belmont: Wadsworth, 1963
Buku Teks
Prensky, Sol D.
Buku Teks
Srivastava, A.C.
Vani Educational Books, [Date of publication not identified]
Buku Teks